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Ivan Krejcí, Jana Parílková
INSTRUMENTATION USED FOR DIKES MONITORING

Instrumentation technique and processing of analog and digital signals in specially designed equipments are described. Parameters of instruments that have been built for purposes of the thermal scalar field monitoring and for electrical impedance spectroscopy are discussed.

Károly Molnár, István Bogár, András Görgényi, László Sujbert
DYNAMIC WEIGHING SYSTEM OF RAILWAY CARRIAGES

The Dynamic Railway Diagnostics system (DRD) is a DSP-based measurement system, that analyses and stores the deformation signal of the rail caused by a passing train. The weight of the carriage is calculated by signal processing methods, by digital signal processors. This architecture makes the system capable of performing also other signal processing algorithms on this signal, e.g. faulty wheels can be detected. The DSP-based measurement method is a new approach in the field of in-motion weighing. This method can weigh and perform the diagnostics on trains travelling up to 160 km/h.

Karol Korcz, Beata Palczynska, Ludwik Spiralski
DIGITAL METHOD OF MEASUREMENT OF UNWANTED SIGNALS IN COMMUNICATION RECEIVERS

The software way of the estimation of the quantities the unwanted signals, on the basis of the digital data, at a communication receiver output has been presented. Advantages of the presented digital method in comparison with these recommended by the standard methods have been given. Thanks to the use of the separating operation of random and determined components in the digital stored measuring signal, the very low measurement errors of the estimated parameters have been achieved.

Aimé Lay-Ekuakille, Amerigo Trotta
BINOMIAL FILTERING TO IMPROVE BACKSCATTERED LIDAR SIGNAL CONTENT

Binomial filter may be applied wherever easily predictable smoothing is required. That is possible in lidar signal processing. Digital filtering is a way of extracting noise from signal [1] beside poissonian averaging. Binomial filtering is useful in making data easier to interpret provided that proper perspective relative to measurement errors is maintained. Kaiser algorithm has been used to improve recovered data.

Pekka Kumpulainen, Kimmo Hätönen, Pekko Vehviläinen
AUTOMATIC DISCRETIZATION IN PREPROCESSING FOR DATA ANALYSIS IN MOBILE NETWORK

Several data mining methods require discretization of the data, rough sets and association rules for example. In this paper we present simple discretization methods for two types of variables common in telecommunications network. The variables are first classified in order to apply the proper discretization method. These methods are based on the amplitude distribution of the variables. Methods are unsupervised, i.e. they do not require class information for the samples.

Heikki Jokinen
A METHOD TO DETECT SUDDEN CHANGES IN SIGNALS

Measurements may contain disturbances like transients or abrupt level changes. Although the duration of these effects is often short, the computed results derived from the measurements may be heavily corrupted. In order to be able to analyse only the non-disturbed region of the signal, the detection of anomalies is needed. In this paper we introduce a method for detecting sudden changes applying windowed moving variance computation technique.

Stanislaw Moskowicz
A CONTACTLESS TWO-SENSOR DC TRANSDUCER – TRANSDUCTION FUNCTION ANALYSIS

In the paper the design and operation principle of a contactless two-sensor DC transducer is presented. The operation of the transducer makes use of the signal yielded by two fluxgate sensors based DC transducer situated at a certain distance from the wire traversed by the current to be measured. The proposed geometrical arrangement of the sensor makes the transduction accuracy less sensitive to inaccurate keeping the distance between the sensor and the wire flowed through by the current to be measured.

Alessio Cavuoto, Luca De Vito, Gioacchino Truglia
AN INSTRUMENT FOR RESIDENTIAL GATEWAY AND NETWORK TESTING

In this paper an innovative instrument for analysis and testing of gateways used in residential and small office environments is presented. The gateways are widely used in today’s network systems, in which the demand of broadband connections and additional services becomes relevant. In the paper a brief description of the functional specifications and a high level view of the hardware and software architecture are given. In addition, the test procedures implemented in the instrument will be described and discussed.

Luka Ferkovic, Josip Butorac
DETERMINATION OF EQUIVALENT PARAMETERS FOR INDUCTANCE STANDARDS

The confidence in self inductance base can be obtained by regular comparisons between particular metrological laboratories and by mutual comparisons of inductance standards within own laboratory. Standard methods of inductance measurements in its applications don't give explicitly all of parameters of standard substitute circuit nor the accuracy which is requested by fundamental principles of inductance standard calibration. In order to ensure the adequate low measurement uncertainty, which suits these requirements, it is necessary to elaborate the procedure of standard calibration.

Codrin Donciu, Mihai Cretu, Cristian Fosalau
A MEASUREMENT SYSTEM FOR REMOTE TEACHING AND EDUCATION

In the present paper, prototype architecture for an educational measurement system having geographical distributed users is illustrated. The students are required to use only a simple commercial Internet Web browser. In this way, several geographically remote stations can economically offer a more complete educational proposal specialised in different measuring fields.

Page 894 of 912 Results 8931 - 8940 of 9113